Campbell Scientific 227-L Delmhorst Cylindrical Soil Moisture Block - Manual (Page 7)

227 Delmhorst Cylindrical
Soil Moisture Block
1. Introduction
The 227 is a gypsum block that determines soil water potential by measuring
electrical resistance. When the 227 is wet, electrical resistance is low. As the
227 dries, resistance increases. This gypsum block connects directly to a
datalogger.
The –L option on the model 227-L indicates that the cable length is user
specified. This manual refers to the sensor as the 227.
Before using the 227, please study
• Section 2, Cautionary Statements
• Section 3, Initial Inspection
• Section 4, Quickstart
2. Cautionary Statements
• The black outer jacket of the cable is Santoprene ® rubber. This jacket will
support combustion in air. It is rated as slow burning when tested
according to U.L. 94 H.B. and will pass FMVSS302. Local fire codes
may preclude its use inside buildings.
• Avoid installing in depressions where water will puddle after a rain storm.
• Don’t place the 227 in high spots or near changes in slope unless wanting
to measure the variability created by such differences.
• To maximize longevity, remove the gypsum block during the winter.
3. Initial Inspection
• Upon receipt of the 227, inspect the packaging and contents for damage.
File damage claims with the shipping company.
• The model number and cable length are printed on a label at the
connection end of the cable. Check this information against the shipping
documents to ensure the correct product and cable length are received.
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